suricata not detect!

[Rout3rx]

hi
i configure IPS mode and select my WAN interface for detection.
but when i start for example nmap -sA it not detect anything!!!
what is the problem?

[Rout3rx]

is there anyone to help me?

[Deepak Kumar]

There are many reasons
1. May be IPS mode not enabled
2. May be IPS signature not enabled
3. Right Interface is not selected etc

Please share your network diagram and firewall configurations.